Companion plants for Garden Phlox
Garden Phlox blooms from July through September. It wants full sun and moderate water. The 8 companion pairings below each state why the pairing works.
Blooming before Garden Phlox opens

Chick Charms Cosmic Candy Hens & Chicks
Shares full sun and low to moderate water; blooms in late spring, before this one opens; low at 4 in, to carpet the ground beneath; both are strong pollinator plants, and they feed in different months.

Sea Thrift
Shares full sun and low to moderate water; blooms in mid spring, before this one opens; lower at 8 in, for the front of the border; both offer pollinator forage, in different months.

Decadence Vanilla Cream False Indigo
Shares full sun and moderate water; blooms in late spring, before this one opens; both are strong pollinator plants, and they feed in different months; its seed heads stand through winter, for structure and the birds.

Inkberry Holly
Shares full sun and moderate water; blooms in late spring, before this one opens; both are strong pollinator plants, and they feed in different months; evergreen, so the bed keeps its shape through winter.

Kinnikinnick
Shares full sun and moderate water; blooms in mid spring, before this one opens; lower at 8 in, for the front of the border; both are strong pollinator plants, and they feed in different months.

Prairie Junegrass
Shares full sun and low to moderate water; blooms in late spring, before this one opens; both are strong pollinator plants, and they feed in different months; evergreen, so the bed keeps its shape through winter.

Ever After Ruby Reblooming Azalea
Takes full sun to part sun and moderate water; blooms in mid spring, before this one opens; both are strong pollinator plants, and they feed in different months; evergreen, so the bed keeps its shape through winter.
Blooming alongside

Thyme
Shares full sun and low to moderate water; opens in late spring and overlaps into this one's season; low at 6 in, to carpet the ground beneath; both are strong pollinator plants.